MAP sensor feed voltage lost
MAP sensor feed voltage lost The feed voltage from the PCM to the MAP was lost for some reason. The PCM will only send 0.5v or less to the MAP sensor (checked @ the PCM, as well as, the MAP sensor) which causes a low input voltage code. The issue is internal to the PCM.
I sent a new reference voltage to the MAP sensor from an unused 5v PCM source of which has corrected the problem. The original pin# for the MAP feed voltage is #64 on the blue connector & the new feed (jumper) comes from #71 (unused) on the blue connector. It's a 98 PCM. Anyone ever run into this before?
I sent a new reference voltage to the MAP sensor from an unused 5v PCM source of which has corrected the problem. The original pin# for the MAP feed voltage is #64 on the blue connector & the new feed (jumper) comes from #71 (unused) on the blue connector. It's a 98 PCM. Anyone ever run into this before?
No one?
Probably, when this happens, the PCM is replaced. Will leave it posted for the archives as an alternative when a PCM feed voltage is lost. This problem may be a sign that the PCM is crapping out & I do have a spare PCM that only needs a crank relearn, should that happen.
Probably, when this happens, the PCM is replaced. Will leave it posted for the archives as an alternative when a PCM feed voltage is lost. This problem may be a sign that the PCM is crapping out & I do have a spare PCM that only needs a crank relearn, should that happen.
